three.js/examples/jsm/nodes/utils/JoinNode.js

import { TempNode } from '../core/TempNode.js';
import { NodeUtils } from '../core/NodeUtils.js';

var inputs = NodeUtils.elements;

function JoinNode( x, y, z, w ) {

	TempNode.call( this, 'f' );

	this.x = x;
	this.y = y;
	this.z = z;
	this.w = w;

}

JoinNode.prototype = Object.create( TempNode.prototype );
JoinNode.prototype.constructor = JoinNode;
JoinNode.prototype.nodeType = 'Join';

JoinNode.prototype.getNumElements = function () {

	var i = inputs.length;

	while ( i -- ) {

		if ( this[ inputs[ i ] ] !== undefined ) {

			++ i;

			break;

		}

	}

	return Math.max( i, 2 );

};

JoinNode.prototype.getType = function ( builder ) {

	return builder.getTypeFromLength( this.getNumElements() );

};

JoinNode.prototype.generate = function ( builder, output ) {

	var type = this.getType( builder ),
		length = this.getNumElements(),
		outputs = [];

	for ( var i = 0; i < length; i ++ ) {

		var elm = this[ inputs[ i ] ];

		outputs.push( elm ? elm.build( builder, 'f' ) : '0.0' );

	}

	var code = ( length > 1 ? builder.getConstructorFromLength( length ) : '' ) + '( ' + outputs.join( ', ' ) + ' )';

	return builder.format( code, type, output );

};

JoinNode.prototype.copy = function ( source ) {

	TempNode.prototype.copy.call( this, source );

	for ( var prop in source.inputs ) {

		this[ prop ] = source.inputs[ prop ];

	}

	return this;

};

JoinNode.prototype.toJSON = function ( meta ) {

	var data = this.getJSONNode( meta );

	if ( ! data ) {

		data = this.createJSONNode( meta );

		data.inputs = {};

		var length = this.getNumElements();

		for ( var i = 0; i < length; i ++ ) {

			var elm = this[ inputs[ i ] ];

			if ( elm ) {

				data.inputs[ inputs[ i ] ] = elm.toJSON( meta ).uuid;

			}

		}


	}

	return data;

};

export { JoinNode };